NSPEC Innovations AR-40 40 S&W Build Kit
Build your next AR-40 with confidence using the NSPEC Innovations AR-40 40 S&W Build Kit. Designed for builders who want a compact, blowback-operated AR platform chambered in 40 S&W, this kit includes the key components needed for a reliable pistol-caliber build.
Compact 4-Inch 40 S&W Barrel
This AR-40 build kit features a 4-inch barrel chambered in 40 S&W with a 1:16 twist rate. The compact barrel length makes it ideal for short-format AR pistol builds while maintaining compatibility with the 40 S&W cartridge.
Blowback Gas System
The kit uses a simple and proven blowback operating system, commonly used in pistol-caliber AR builds for dependable cycling and straightforward operation.
Threaded Barrel with A2 Flash Hider
The barrel is threaded 5/8x24 and includes an A2 flash hider, giving the build a clean, functional muzzle setup right out of the box.
Included Nitride Bolt Carrier Group
A nitride-finished bolt carrier group is included with the kit, offering enhanced surface hardness, corrosion resistance, and smooth operation.
Durable Receiver and Components
The receiver is made from forged 7075-T6 aluminum, providing strength and durability for your AR-40 platform. The included 6061-T6 aluminum charging handle, standard A2 grip, pistol tube, and 7 oz. buffer round out the build package.
AR-40 40 S&W Build Kit Specifications
| Brand | NSPEC Innovations |
| Caliber | 40 S&W |
| Barrel Length | 4" |
| Twist Rate | 1:16 |
| Gas System | Blowback |
| Muzzle Thread | 5/8x24 |
| Muzzle Device | A2 Flash Hider |
| Bolt Carrier Group | Included |
| BCG Finish | Nitride |
| Receiver Material | Forged 7075-T6 Aluminum |
| Charging Handle | 6061-T6 Aluminum |
| Buttstock | Pistol Tube |
| Buffer | 7 oz. |
| Grip | Standard A2 |
Why Choose the NSPEC Innovations AR-40 Build Kit?
The NSPEC Innovations AR-40 40 S&W Build Kit is built for shooters and builders looking for a compact pistol-caliber AR setup with durable materials, included BCG, nitride finish, and a straightforward blowback system. Whether you are completing a new AR-40 build or upgrading your current platform, this kit provides a strong foundation for a reliable 40 S&W configuration.
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